Node JS.md

Terminate an application

process.exit([code])
Ends the process with the specified code.
If omitted, exit uses the 'success' code 0.
To exit with a 'failure' code: process.exit(1);
The shell that executed node should see the exit code as 1.

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Check if a file exists

var fs = require('fs');
if (fs.existsSync(path)) {
    // Do something
}